The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2007
Filed:
Apr. 29, 2004
Chiharu Isobe, Tokyo, JP;
Yoshio Sakai, Kanagawa, JP;
Chiharu Isobe, Tokyo, JP;
Yoshio Sakai, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A ferroelectric capacitor is provided in which the surface area of a ferroelectric thin film is expanded to increase the amount of polarization. In the ferroelectric capacitor, hemi-spherical protruding parts 31 are formed with HSG-growth on the surface of a polycrystalline silicon film 30. On the polycrystalline silicon film 30 having the hemi-spherical protruding parts 31 are sequentially laminated an adhesive layer 32, lower electrode 33, ferroelectric film 34, and upper electrode 35. The ferroelectric film 34 is shaped to overlap the shape of hemi-spherical protruding parts 31 of the polycrystalline silicon film 30, and the surface area thereof is expanded.